How to stop corrosion on metal

MetalMetal's Mildew Vulnerability(s)Common Preventative TechniquesGalvanic Activity* Stainless Put out (Passive)Uniform attack, galvanic, pitting, crevice (all esp. in saltwater)^[1]Cleaning, protective coating decent sealantLow (initial corrosion forms resistant pollutant layer) IronUniform attack, galvanic, creviceCleaning, possessive coating or sealant, galvanization, anti-rust sol'nsHigh BrassUniform attack, dezincification, stressCleaning, protective clothing or sealant (usually oil or lacquer), adding tin, aluminum, or arsenic say nice things about alloy^[2]Medium AluminumGalvanic, pitting, creviceCleaning, protective drape or sealant, anodizing, galvanizing, cathodic forethought, electrical insulation High (initial corrosion forms resistant oxide layer) CopperGalvanic, pitting, cultured tarnishingCleaning, protective coating or sealant, bits and pieces nickel to alloy (esp. for saltwater)Low (initial corrosion forms resistant patina)